BILLYBIGWIG said:i think you will find that the 138+R is infact a 57mm full skirt piston not a 56mm 56mm x 54mm is only a 132.9cc
taz69 said:Hey Z would you OR Smiffy know the Takegawa part # to the 56mm piston you were using. I have one thats a 01-02-8242.. It was on a 124+R engine that takegawa made for a little while.. It was a 50mm crank by 56mm piston.. Works great on a 54mm crank as well with a 69mm cylinder.. Just looking to see what piston you guys were using???? And it was made for the Superhead +R with the older 28mm intake and what not..
burch753 said:They made a 56mm piston? forged? skirted?
Does anyone know if they made any forged pistons other than the 54mm for the old superhead and the 57mm (138) scut?
I love the idea of a 56 x 50 motor... how did it run?
smiffy said:i took a 124 takegawa cylinder and did exactly that, i couldnt find anyone at the time that did a cylinder to fit.
was a waste of a brand new +r barrel but hey i had to do it.
smiffy said:z had the 138 piston which is actually a 57mm piston.
Could be done, but good luck trying to get a gasket to not leak on a crf (gb4) cased motor